Final answer:
To prepare carbon dioxide gas in the laboratory, react bicarbonate of soda with a strong acid like hydrochloric acid.
Explanation:
Carbon dioxide gas can be prepared in the laboratory by reacting a metal carbonate or bicarbonate with a strong acid. For example, adding bicarbonate of soda to a small bottle and then adding dilute hydrochloric acid will produce carbon dioxide gas. This gas can be collected in a container for various experiments or measurements.
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